The Royals optioned Black to Triple-A Omaha on Thursday.
Black pitched two scoreless innings during Wednesday's contest, marking the first time since June 7 that he didn't give up a run during an appearance in the big leagues. Now carrying a 4.31 ERA and 1.60 WHIP on the season, he'll move back down to Triple-A so the Royals can bring in a fresh arm in the form of Anthony Gose.